You've reduced your portion sizes, avoided sugary foods, and even exercised regularly, but the number on the scale still hasn't changed? If you're experiencing this, don't give up. The fact is, not all diets produce the same results for everyone.
Difficulty losing weight can be influenced by many factors, from an unhealthy diet to certain health conditions, and even the body's biological response to diet. Therefore, it's important to understand the underlying causes to ensure your efforts are not wasted.
1. The calories consumed are still more than those burned
Many people feel like they have eaten little, but without realizing it, they are still consuming high-calorie foods or drinks, such as coffee with sugar, trendy drinks, snacks, or sauces used when eating.
Calories from snacks or drinks are often not realized, even though the amount can be quite large and hinder weight loss.
2. Unbalanced Diet
Dieting doesn't just mean reducing the amount of food you eat. The body still needs balanced amounts of carbohydrates, protein, healthy fats, vitamins, and minerals.
For example, consuming too little protein can cause the body to lose muscle mass. As a result, the body's metabolism slows down, thus burning fewer calories. When dieting, daily protein requirements are generally higher than usual —around 1.2–1.6 grams per kilogram of body weight—specifically to maintain muscle mass during weight loss.
3. The body undergoes “metabolic adaptation”
This is something that often goes unnoticed: when in a prolonged calorie deficit, the body naturally slows down its own metabolism as a survival response — a mechanism that recent research (2025) suggests starts happening as early as the first four weeks of the diet.
The faster and more drastic the weight loss, the greater the metabolic slowdown. One study even found that people who lost weight rapidly (about 16% of their initial weight in a short period of time) experienced a metabolic slowdown about 2.5 times greater than those who lost it more gradually. This effect can persist for months, even more than a year after successful weight loss.
So, if your weight stops dropping despite your best efforts, it doesn't mean you've failed — it's simply your body's natural response that needs to be addressed with the right strategies, such as periodically resetting your calorie intake and maintaining muscle mass.
4. Lack of Physical Activity
Regulating your diet is important, but the results will be more optimal if balanced with regular physical activity.
You don't have to jump straight into strenuous exercise. Walking, cycling, swimming, or strength training several times a week can also help increase calorie burn and maintain muscle mass—while also helping to mitigate the effects of the metabolic adaptations mentioned above.
5. Lack of Sleep and Stress
Lack of sleep or prolonged stress can affect the hormones that regulate hunger and satiety: leptin (the satiety hormone, whose levels decrease) and ghrelin (the hunger hormone, whose levels increase). As a result, a person feels hungrier more easily, especially craving foods high in sugar or fat.
Apart from that, stress can also make someone overeat without realizing it (emotional eating).
6. Have Certain Medical Conditions
For some people, weight loss is difficult due to certain health conditions, such as hormonal disorders, metabolic disorders, or side effects of certain medications.
If you are following a healthy lifestyle but your weight remains unchanged, a medical examination can help identify the underlying cause.
7. Diet Targets Too High or Too Fast
Many people hope to lose weight quickly. However, healthy weight loss is achieved gradually.
Losing weight slowly is generally easier to maintain in the long term than overly restrictive diets that produce quick results but are easily regained — in line with the metabolic adaptation point above, the more drastic the loss, the greater the body's "resistance" to it.
A Proper Diet Isn't Just About Eating Less
Everyone has different calorie needs, health conditions, and lifestyles. Therefore, there's no one-size-fits-all diet.
This also applies to those undergoing a weight loss program with the assistance of medication. Recent research shows that anyone trying to lose weight—with or without medication—still needs to maintain protein intake and strength training to ensure that the weight loss actually comes from fat, not muscle mass, which can slow metabolism.
A clinical nutrition specialist will help you evaluate your overall health, calculate your calorie needs based on your age, activity level, and goals, and develop a safe and realistic diet.
This approach not only aims to lose weight, but also maintain overall body health.
When Should You Consult a Clinical Nutrition Specialist?
Immediately consult a clinical nutrition specialist if:
- My weight doesn't go down even though I've been dieting and exercising regularly.
- Weight continues to increase for no apparent reason.
- Having obesity or excess waist circumference.
- Having diseases such as diabetes, high cholesterol, hypertension, or gout that require special dietary arrangements.
- Confused about determining a diet that suits your body condition.
Conclusion
Being difficult to lose weight doesn't mean you're not trying hard enough. It could be that there's a diet that needs to be improved, a lifestyle that needs to be adjusted, a body response in the form of metabolic adaptations that need to be addressed, or a specific health condition that needs to be evaluated.
Rather than continually trying different diets that may or may not be suitable, consult a clinical nutrition specialist to find a safer, healthier weight loss program tailored to your body's needs. With the right guidance, you can gradually achieve your ideal weight while maintaining long-term health.
The article was written by Dr. Yuliyana Kusaeri, M.Gizi, Sp.GK (Clinical Nutrition Specialist at EMC Cibitung & Pekayon Hospital).
Compiled with reference to recent studies on metabolic adaptation in Frontiers in Nutrition (2025), Cell Reports Medicine (2025), and the American Journal of Clinical Nutrition (2025).